import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'
import { constantRoutes } from '@/router'

import Layout from '@/layout' // 引入Layout
import NotFound from '@/views/404.vue'
const _import = require('./router/_import_' + process.env.NODE_ENV) // 引入获取组件的方法

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/login'] // no redirect whitelist

router.beforeEach(async (to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done()
    } else {
      const hasGetUserInfo = store.getters.nickname
      if (hasGetUserInfo) {
        next()
      } else {
        try {
          // get user info
          await store.dispatch('user/getInfo')
          // 动态路由
          if (store.getters.menus.length < 1) {
            // global.antRouter = []
            next()
          }
          let newMenus = []
          let menus = filterAsyncRouter(store.getters.menus) //过滤路由
          menus.map(item => {
            let newChild = []
            item.children.map(subitem => {
              ;(subitem = {
                ...subitem,
                meta: { title: `${subitem.meta.name}` }
              }),
                newChild.push(subitem)
            })
            item = {
              ...item,
              meta: { title: `${item.label}` },
              alwaysShow: true,
              children: newChild,
              component: Layout
            }
            newMenus.push(item)
          })
          newMenus.push(
            { path: '/404', component: NotFound, hidden: true },
            {
              path: '*',
              redirect: '/404',
              hidden: true
            }
          )
          let allRoute = constantRoutes.concat(newMenus)
          router.options.routes = allRoute
          router.addRoutes(newMenus) //动态添加路由

          // global.antRouter = menus // 将路由数据传递给全局变量，做侧边栏菜单渲染工作
          next({ ...to, replace: true })
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error.message || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter (asyncRouterMap) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (route.component) {
      if (route.component === 'Layout') {
        // Layout组件特殊处理
        route.component = Layout
      } else {
        route.component = _import(route.component) // 导入组件
      }
    }
    if (route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children)
    }
    return true
  })
  return accessedRouters
}

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})
